Made exception handling of slice info plugin way more robust

CURA-1831

plugins/SliceInfoPlugin/SliceInfo.py

@@ -45,6 +45,7 @@ class SliceInfo(Extension):
         Preferences.getInstance().setValue("info/asked_send_slice_info", True)
 
     def _onWriteStarted(self, output_device):
+        try:
             if not Preferences.getInstance().getValue("info/send_slice_info"):
                 Logger.log("d", "'info/send_slice_info' is turned off.")
                 return # Do nothing, user does not want to send data
@@ -115,4 +116,8 @@ class SliceInfo(Extension):
                 Logger.log("i", "Sent anonymous slice info to %s", self.info_url)
                 f.close()
             except Exception as e:
-            Logger.logException("e", e)
+                Logger.logException("e", "An exception occurred while trying to send slice information")
+        except:
+            # We really can't afford to have a mistake here, as this would break the sending of g-code to a device
+            # (Either saving or directly to a printer). The functionality of the slice data is not *that* important.
+            pass